1. Which of the following correctly lists the fundamental forces in decreasing order of strength?

2. The diagram shows the equipotential lines in a field due to A and B. What may be represented by A and B?

3. Which of the following graphs shows the variation of the gravitational field strength of a planet with distance $r$ from the surface of a planet?

A.			B.
C.			D.

4. An astronaut in a space station orbiting the earth experiences weightlessness.

The following are three statements about the astronaut and the space station:

• I.  The astronaut experiences no gravitational force.
• II.  The centripetal acceleration of the space station is equivalent to the gravitational field strength at that location
• III.  Both the astronaut and the space station have the same acceleration.

Which of these statements is correct?

5. The following statements are given about the forces acting on a satellite in orbit around a planet.

I. The gravitational force on the satellite is proportional to the mass of the planet and the mass of the satellite.
II. The strength of the gravitational field is equal to the weight of the satellite.
III. The centripetal force acting on the satellite is provided by the gravitational force between the planet and the satellite.

Which of these statements are correct?

6. A conducting rod is moving in a magnetic field which is in the direction of out of the page as shown. It is moved in the direction of Side C (opposite to side A) by a force $F$

What is the direction of the electric field established in the conducting rod?

7. The diagram shows the gravitational field between two masses m1​ and m2​.

Which of the following is correct?

8. Two sections of current-carrying wires, $X$ and $Y$, that lie in the plane of the paper are shown below. The arrow in wire $X$ shows the direction of conventional current. Which response gives possible directions of current in wire $Y$ and electromagnetic force acting on $Y$?

9. A satellite of mass $40kg$ is moved from one point in space to another for experimental purposes. The graph below shows how the gravitational potential $V$ of the points that the satellite moves through varies with time $t$.

The change in gravitational potential energy of the satellite is $600MJ$. Which of the following gives the magnitude of the gravitational potential Vf​ at the final location of the satellite?

10. Planet $X$ has half the mass and twice the diameter of planet $Y$. The escape speed from the surface of planet $X$ is given by $v$. What is the escape speed from the surface of planet $Y$ ?

11. Which of the following is equivalent to the unit of electric potential difference?

12. A positive and a negative charge of equal magnitude are located on the same horizontal line.

What is the direction of the net electric field at the point marked X, equidistant from the two charges?

13. Two charges, separated by a large distance, are shown below, along with the electric field lines around each charge.

Which of the following statements is correct?

• I.  The charge $q$ is positive.
• II.  The charge $q$ is equal in magnitude to +Q.
• III.  The electric field magnitude near the charge $q$ is greater than the magnitude of the field near the charge +Q.

14. Planet $X$ has radius $R$ and density $\rho$. The gravitational field strength at the surface of Planet $X$ is $g$.

What is the ratio of the gravitational field strength at the surface of planet Y, which has radius 0.25$R$ and density 3ρ, to that at the surface of Planet X?

15. A spaceship orbits a planet at a distance of $d$ from the center of the planet. Later the spaceship moves and settles into a new orbit of d/2​. which of the following describes the change in kinetic energy, potential energy, and total energy of the spaceship?

16. A conducting rod of length $L$ is moved in a region of uniform magnetic field $B$ to light the filament bulb with a resistance of $R$. The direction of the magnetic field is out of plane.

What is the maximum output power of the bulb?

17. A satellite is in an orbit around a planet of radius $R$. The graph shows the variation of different energy quantities against r, which is the distance from the center of the planet. The graph origin represents the surface of the planet.

Which one of the following statements may be correct about the energies of this satellite?

I. A shows the variation of kinetic energy of the satellite.
II. B shows the variation of the total energy of the satellite.
III. C shows the variation of the sum of kinetic and potential energies of the satellite

18. A point charge is moved between two parallel plates separated by a distance of $5cm$. The potential difference between the points is $50V$.

What is the average electric field $E$?

19. A hydrogen nucleus is held stationary in a uniform vertical electric field, represented by the arrows. Which of the paths shown would require the largest work to be done on the hydrogen nucleus?

20. A current-carrying wire is at right angles to a uniform magnetic field. The magnetic force per unit length on the wire is F/L. The length of the wire, the magnitude of the magnetic field strength, and the current of the wire are all doubled. Which of the following is the magnetic force per unit length on the wire after these changes?

21. The work done on a beta-minus particle when moving it from $Y$ to $X$ is found to be $-10eV$. Equipotential lines are represented by the dashed lines in the diagram.

What is the work done by the field on an electron when it is moved from $Z$ to $W$ in the field shown?

22. A satellite is orbiting a planet at a height $h$ from the surface of the planet. The satellite settles on a lower orbit.

What is correct about the changes to its kinetic energy and the centripetal force acting on the satellite in its new orbit?

23. The gravitational field strength on the surface of the moon is gE/6​​. Two objects of different masses $m$ and $2m$ are released with zero speed on the moon from heights of $h$ and $2h$, respectively, where $h$ is small compared to the radius of the moon.

What are the magnitudes of the accelerations of these objects right after release?

24. A loop of area 5.0cm^2 is placed in a uniform magnetic field of $10mT$. The loop rotates around the vertical axis with a period of $4.0s$.

What is the magnitude of the change in magnetic flux linkage after 2.0 s?

25. Spaceship A orbits Earth with orbital speed vA​ and orbital radius $r$. Spaceship B orbits planet X that has a mass twice that of the earth.

What will be the orbital speed of spaceship B if it were to have the same orbital radius as spaceship A?